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US20110104381A1 - Plasma Treatment of Large-Scale Components - Google Patents

Plasma Treatment of Large-Scale Components Download PDF

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Publication number
US20110104381A1
US20110104381A1 US10/586,009 US58600904A US2011104381A1 US 20110104381 A1 US20110104381 A1 US 20110104381A1 US 58600904 A US58600904 A US 58600904A US 2011104381 A1 US2011104381 A1 US 2011104381A1
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US
United States
Prior art keywords
resonant circuit
component
vacuum chamber
inductance
plasma
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/586,009
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English (en)
Inventor
Stefan Laure
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dr Laure Plasmatechnologie GmnH
Original Assignee
Dr Laure Plasmatechnologie GmnH
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Filing date
Publication date
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Application filed by Dr Laure Plasmatechnologie GmnH filed Critical Dr Laure Plasmatechnologie GmnH
Assigned to DR. LAURE PLASMATECHNOLOGIE GMBH reassignment DR. LAURE PLASMATECHNOLOGIE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LAURE, STEFAN
Publication of US20110104381A1 publication Critical patent/US20110104381A1/en
Abandoned legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
    • H01J37/32082—Radio frequency generated discharge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
    • H01J37/32082—Radio frequency generated discharge
    • H01J37/32174—Circuits specially adapted for controlling the RF discharge

Definitions

  • This invention relates to a device and a method for the plasma treatment of large-volume components by means of a high-frequency electromagnetic field.
  • the functionality and the characteristics of the surface can be selectively affected and modified by appropriate selection of the plasma parameters such as pressure, temperature and plasma composition.
  • Processes in which the particle or energy currents from the plasma are utilized for the treatment, modification or coating of a surface of a wide range of materials are known from the prior art. These processes include, among others, plasma spraying, plasma arc melting, plasma heat treatment processes, plasma CVD (Chemical Vapor Deposition) processes and plasma cleaning.
  • the modification in the functionality of workpiece surfaces is the result of the targeted attack of plasma particles. This modification can be achieved by the interaction with particles with certain chemical characteristics or by the action of radiation emitted by the plasma.
  • a plasma torch is used for generating a plasma.
  • the gas flow is ionized by an arc and heated to temperatures from 10,000 to 20,000 K.
  • the high-frequency plasma torch the gas flow is ionized by applying a high-frequency electromagnetic field to a cylindrical coil.
  • a relatively dense plasma with high energy density is created in a cylindrical discharge tube which is manufactured from a dielectric material.
  • plasma temperatures of up to 20,000 K are achieved.
  • thermal plasmas described above are suitable for treating components that are characterized by specific temperature stability. Such processes cannot be used with plastic components or components that have been painted, which can only be exposed to temperatures that do not exceed 100-200° C.
  • High-frequency generators are also used for producing thin plasmas with relatively low energy densities. Their frequency range lies between a few hundred kilohertz up to several tens of GHz.
  • the plasma is generated as a source on the surfaces of electrodes or antennae and expands across the space. As the distance from the electrode increases, both the composition of the plasma and the intensity of the radiation emitted by the plasma change.
  • the methods of the prior art are not suitable for the treatment of the gaps, joints, cavities and undercuts that are found on automobile bodies.
  • Surfaces that are facing away from the plasma source are not exposed to uniform plasma coverage. Due to the large gradients, uniform processing cannot be ensured on the surfaces facing the plasma source. This limitation applies in particular to processing steps that are dominated by radiation processes.
  • the device taught by the invention with the features of claim 1 and the method taught by the invention with the features of claim 6 has the advantage that large components can be subjected to consistently effective plasma treatment across their entire surface.
  • This treatment includes both interior and exterior surfaces. Gaps, joints, cavities and undercuts can also be processed. Such areas are found in particular on components which consist of multiple elements.
  • the device taught by the invention and the method taught by the invention can be used with any components of various sizes. They are particularly suitable for use on large components such as vehicle bodies, aircraft and machine parts, to cite only a few examples.
  • a prerequisite in this case is that the vacuum chamber must be adequately sized and the transport device must be suitable for use with the component.
  • the component is introduced into a vacuum chamber of the device for plasma treatment.
  • the component is then connected to a resonant circuit with a high-frequency generator.
  • a resonant circuit with a high-frequency generator.
  • either one terminal or two terminals of the resonant circuit are connected to the component.
  • the second terminal is connected to ground. Consequently, the component forms a part of the resonant circuit.
  • the high-frequency alternating current flows through the component.
  • the inductance and the capacitance of the component affect the inductance and the capacitance of the resonant circuit.
  • the resonant circuit which is comprised of the component to be processed and its own capacitances and inductances, must be appropriately adjusted to ensure the optimal coupling of the electrical energy to the component.
  • This adjustment is accomplished by variation of the capacitances and inductances of the resonant circuit.
  • the capacitances and inductances of the resonant circuit can be adjusted either manually or automatically. For automatic adjustment, first the capacitance and the inductance of the component are determined. The variation of the capacitances and inductances of the resonant circuit results in a change of the frequency.
  • a chemical treatment of the component surface can be performed by the chemical action of the plasma particles.
  • the physical characteristics of the surface can be affected by the plasma radiation. This includes cross-linking of UV varnishes, for instance.
  • electrical effects occur on the surface which can be used for its treatment.
  • the distance of the electrodes from the component does not have to be adjusted.
  • the plasma is generated through the formation of eddy currents on the surface of the component.
  • the alternating current flowing through the component induces oscillating magnetic fields which propagate in the vicinity of the component as a function of the geometry of the component.
  • the change of the magnetic field over time results in electrical fields which are responsible for the generation and maintenance of the plasma in the vicinity of the component.
  • the transport device for introducing the component into the vacuum chamber comprises one or more rails and a drive system.
  • the rails can be adapted to the component.
  • Electrical isolation is provided on the rails or in the vicinity of the rails to isolate the component with respect to the vacuum chamber.
  • the resonant circuit comprises high-frequency lines.
  • Bushings with electrical isolation for the high-frequency lines are provided on the vacuum chamber.
  • metal plates, pipes and/or grids are provided.
  • the component represents an antenna, from which electromagnetic waves are radiated into the space of the vacuum chamber. This effect can be promoted by further antenna-like elements in the vicinity of the component. These elements can include metal plates or grids. This effect can also be produced by pipes made of copper which are arranged in the form of a spiral. The electromagnetic waves couple into these parts and ensure additional plasma generation at a certain distance from the component. In this manner, the radiant flux of the plasma toward the component can be controlled.
  • an industrial gas is introduced into the vacuum chamber.
  • the pressure in the vacuum chamber can be increased.
  • This pressure can be up to 1000 Pa, for example.
  • the industrial gas interacts chemically with the surface of the component.
  • a number of different gases can be used as industrial gases, depending on the requirement.
  • a liquid is vaporized and introduced into the vacuum chamber through a valve.
  • the vapor from the liquid performs the same task as the industrial gases.
  • an alternating voltage at 0.8 to 10 MHz is fed into the resonant circuit via the high-frequency generator.
  • Particular preference is given to an alternating voltage between 1 and 4 MHz.
  • the vacuum chamber is evacuated to a pressure between 0.05 and 0.5 Pa.
  • the working pressure can be increased to several tens of mbars, depending on the application. In this way, a further resource can be made available to control the number of particles that interact with the surface of the component to be treated.
  • the pressure in the chamber is significantly higher.
  • FIG. 1 Device for plasma treatment, viewed from the front,
  • FIG. 2 Device for plasma treatment viewed from the top
  • FIG. 3 Circuit diagram for the device according to FIGS. 1 and 2 .
  • FIGS. 1 and 2 show a device for plasma treatment, viewed from the front and from the top.
  • a component 1 to be treated is driven into a vacuum chamber 3 via rails 2 and rollers which are not discernible in the drawing.
  • Rails 2 are provided with isolation 4 , which isolates the component 1 with respect to the vacuum chamber 3 .
  • contact is made between a high-frequency resonant circuit and the component. This contact is made by means of a sliding contact which is not discernible in the drawing and adheres to the component 1 by means of an interlocking fit.
  • the component is now part of the resonant circuit.
  • the resonant circuit is comprised of a high-frequency generator 5 with a feedback coil 11 , shown in FIG.
  • a high-frequency bushing 9 is provided for the high-frequency feed 8 in the vacuum chamber 3 .
  • a reflector 10 for the plasma is provided above the component.
  • FIG. 3 shows a schematic circuit diagram of the device illustrated in FIGS. 1 and 2 .
  • the circuitry makes possible the optimization of the plasma treatment.
  • the high-frequency generator 5 supplies alternating current to the resonant circuit via a coaxial cable 6 .
  • the high-frequency generator 5 has a feedback coil 11 , in which the inductance can be automatically adjusted.
  • Three capacitors 12 are provided in the external resonant circuit 7 . They can be either all or partially integrated in the resonant circuit to vary the overall capacitance.
  • the inductance of the resonant circuit is essentially determined by component 1 .
  • Component 1 is connected to the external resonant circuit 7 via the high-frequency feed 8 .
  • a coil 13 is provided on the external resonant circuit.
  • a further coil 14 with a tap on the high-frequency feed 8 is provided directly on coil 13 .
  • This coil is integrated into the resonant circuit only if so required for the adjustment of the overall inductance.
  • the high-frequency feed 8 a is then used instead of the high-frequency feed 8 .
  • the component 1 can be optionally grounded via ground conductor 15 .
  • the contact between component 1 and the resonant circuit can be checked by feeding a high-frequency alternating current at very low power. If the contact meets the requirements, the vacuum chamber 3 is evacuated. After the pressure in the vacuum chamber 3 has reached a certain value which depends on the type of treatment, high-frequency alternating current is fed into the resonant circuit.
  • the plasma which is required for the treatment of the component is formed on the surface of component 1 .
  • the influence of the plasma on the surface of the component is controlled by adjusting the anode voltage of a transmitting tube 16 which feeds the alternating current into the resonant circuit.
  • the transmitting tube is not shown in the drawing.
  • the efficiency of the coupling of the electric power into the plasma can be monitored by monitoring the current/voltage characteristic curve of the transmitting tube 16 of the resonant circuit.
  • the fine-tuning of the resonant circuit during the plasma treatment is through variation of the inductance of the feedback coil of the resonant circuit.
  • a rough adjustment of the system to the component to be treated can be made by inserting additional inductances 14 or capacitances 12 into the resonant circuit.
  • the vacuum chamber 3 is restored to atmospheric pressure. The contact to the resonant circuit is broken and the component 1 is transported out of the vacuum chamber 3 .

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Electromagnetism (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Plasma Technology (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Treatment Of Fiber Materials (AREA)
US10/586,009 2004-01-15 2004-06-21 Plasma Treatment of Large-Scale Components Abandoned US20110104381A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004002878 2004-01-15
DE102004002878.8 2004-01-15
PCT/DE2005/000047 WO2005069703A2 (de) 2004-01-15 2005-01-14 Plasmabehandlung grossvolumiger bauteile

Publications (1)

Publication Number Publication Date
US20110104381A1 true US20110104381A1 (en) 2011-05-05

Family

ID=34778097

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/586,009 Abandoned US20110104381A1 (en) 2004-01-15 2004-06-21 Plasma Treatment of Large-Scale Components

Country Status (6)

Country Link
US (1) US20110104381A1 (de)
EP (1) EP1704756B1 (de)
JP (1) JP5597340B2 (de)
AT (1) ATE372661T1 (de)
DE (2) DE112005000627B4 (de)
WO (1) WO2005069703A2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100323126A1 (en) * 2007-02-26 2010-12-23 Dr. Laure Plasmatechnologie Gmnh Apparatus and Method for Plasma-Assisted Coating and Surface Treatment of Voluminous Parts

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112006001571A5 (de) * 2005-04-11 2008-03-27 Dr. Laure Plasmatechnologie Gmbh Vorrichtung und Verfahren zur Plasmabeschichtung
EP2142679B1 (de) * 2007-03-09 2013-05-22 Dr. Laure Plasmatechnologie Gmbh VERFAHREN ZUR PLASMAGESTÜTZTEN OBERFLÄCHENBEHANDLUNG GROßVOLUMIGER BAUTEILE
DE102014204159B3 (de) * 2014-03-06 2015-06-18 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Hochfrequenzelektrodenvorrichtung

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US4226897A (en) * 1977-12-05 1980-10-07 Plasma Physics Corporation Method of forming semiconducting materials and barriers
US4781145A (en) * 1985-07-26 1988-11-01 Amlinsky Roman A Detonation deposition apparatus
US4916273A (en) * 1987-03-11 1990-04-10 Browning James A High-velocity controlled-temperature plasma spray method
US4991542A (en) * 1987-10-14 1991-02-12 The Furukawa Electric Co., Ltd. Method of forming a thin film by plasma CVD and apapratus for forming a thin film
US5079031A (en) * 1988-03-22 1992-01-07 Semiconductor Energy Laboratory Co., Ltd. Apparatus and method for forming thin films
US5243169A (en) * 1989-11-07 1993-09-07 Onoda Cement Co., Ltd. Multiple torch type plasma generation device and method of generating plasma using the same
US5077499A (en) * 1990-04-18 1991-12-31 Mitsubishi Denki Kabushiki Kaisha High-frequency feeding method for use in plasma apparatus and device for carrying out the method
US5211995A (en) * 1991-09-30 1993-05-18 Manfred R. Kuehnle Method of protecting an organic surface by deposition of an inorganic refractory coating thereon
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US20050236374A1 (en) * 2004-04-01 2005-10-27 Lincoln Global, Inc. Device for processing welding wire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100323126A1 (en) * 2007-02-26 2010-12-23 Dr. Laure Plasmatechnologie Gmnh Apparatus and Method for Plasma-Assisted Coating and Surface Treatment of Voluminous Parts

Also Published As

Publication number Publication date
JP2007518233A (ja) 2007-07-05
WO2005069703A3 (de) 2006-05-18
DE112005000627B4 (de) 2014-10-23
EP1704756B1 (de) 2007-09-05
EP1704756A2 (de) 2006-09-27
JP5597340B2 (ja) 2014-10-01
ATE372661T1 (de) 2007-09-15
WO2005069703A2 (de) 2005-07-28
DE112005000627D2 (de) 2006-11-30
DE502005001421D1 (de) 2007-10-18

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